6
3 x 3 group
4 auxiliary keys
4 x 4 group
4.1: The 4 Auxiliary Keys
row 1 Turn Light on/off (Version with backlit display)
Help mode on/off (Version without backlit display)
row 2 Increase volume
row 3 Decrease volume
row 4 Repeat input
4.2: 3 x 3 Group (from left to right)
row 1 short = time
long = date
short = recall memory
long = save value
short = on / delete
long = delete last digit
row 2 short = recall formula
long = select formula
short = repeat
long = menu
short = recall conversion
long = select conversion
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